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1) soo'r'r, J."J. MAN N & J. H. S1\[ITH.-v KNIFE FOB CUTTING 'PILB FABRICS.

N0: 539,147. Patented May 14, 1895.

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D.'SCOTT, J. J. MANN 8v J. E. SMITH.

KNIFE FOR CUTTING PILE PABRIGS- I No. 539,147. Patented May 14. .1895.

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DUGALD SCOTT, OF MANCHESTER, AND JOHN JAMES MANN AND JAMES HOYLE SMITH, OF SALFORD, ASSIGNORS TO THE FUSTIAN CUTTING MACHINE COMPANY, LIMITED, OF SALFORD, ENGLAND.

KNIFE FOR CUTTING PILE FABRICS.

SPECIFICATION forming part of Letters Patent No. 539,147, dated May 14, 1895. Application filed February 6 1894. Serial No. 499,293. (No model.) Patented in Switzerland January 30, 1894, No. 7.969.

To ctZZ whom it may concern:

Be it known that we, DUGALD Soo'rr, residing at Manchester, and JOHN JAMES MANN and JAMES HOYLE SMITH, residing at Salford, in the county of Lancaster, England, subjects of the Queen of GreatBritain and Ireland, have invented Improvements in Knives for'Outting Pile Fabrics, (for which Letters Patent No. 7,969, and dated January 30, 1894:,have been obtained in Switzerland,) of which the following is a specification.

This invention relates to the knives used for the cutting of weft pile fabrics, and more especially to those used in connection with fustian. cutting, machines, the object of the invention being to reduce to a minimum the damage occasioned when the point of the knife cuts through the back of the cloth particularly when the cloth in the machine is running at high speed.

Many devices have been invented either to, drop the knife upon the cloth or to withdraw it from the hole before a long slit can be formed, but such devices have not been quite successful at high speeds.

According to the present invention we so mount the knife and guide in the handle or holder that they can be retained when the pile is being properly out, but if the point goes through the back of the cloththe said cloth will automatically release the said knife and guide and separate them from the handle or holder so that they (the knife and guide) will fall or pass clear through to the back side of the cloth and make no larger hole than is necessary to allow them to fall clear through the cloth. This can be accomplished in several ways, as will be seen by Figures 1, 2, 3, at, and 5, which illustrate, as examples, three methods of connecting the knife and guide to the handle or knife-holder in the desired way.

Figs. 2, 4, and 5 are elevations of these modilied forms of ourinvention, showing the front end of the knife handle or holder with the knife and guide attached for cutting. Fig. l is a section through about the line A B on 3 is a view of the end of the apparatus shown In the various figures a is the handle or holder and b the guide which inoloses the knife 0 in the usual way.

The dotted line d (on Figs. 2, i and 5) represents the cloth which is moved rapidly in the direction shown by the arrow (or the knife is passed rapidly over the cloth in the reverse direction). I

It will be seen in all the figures that the knife 0 and guide'b are quite separate from the handle or holder a but are held therein, see Figs. 1 and 2, by levers or arms eeor (see Fig. 5) by a removable socket in the form,for example, of a small cylinder 6 Any other means for temporarily fixing the knife and guide in the holder may be employed. The knife and guide are made as short as possible and without projecting parts so as to pass clear through the back of the cloth without hinderance and without causing a large hole or slit.

In the case shown at Fig. 1, the knife 0 and guide I) are held by the jaws e at the lower end of the arms 6 e, the arm e being by preference fixed to the part a of the handle or holder at and the arm e being pivoted thereto at the point The loose end of the spring triggerfrests upon the guide I) and in the groove thereof, not being in any other way attached thereto, but being self-adjusting as shown in the slotted end of the trigger lever f to the upper end of which is connected by a link f a small distance piece, block or wedge g inserted between the upper end of the arms e and e which are held together by an india rubber ring it or other spring connection. An india rubber or other spring 1 holds the leverf in the position shown on the drawings and retains the piece g between the arms e and e. The rear end of the knife abuts against the fixed piece a and is protected by a hood i from displacement (by the pressure of the spring trigger f or otherwise).

It will be seen that should the point of the guide b pierce through the back of the cloth d which as before explained, is passing rapidly 5 or wedge from between the arms eand e, and the spring 72. will-draw the upper ends of the arms e and e togetherand separate the jaws e so that the knife and its guide b become detached and fall from holder or handle a, and owing to their inertia and the rapid motion of the cloth they will fall and drop clear through to the back side of the cloth and only a small puncture (suflicient to allow of to this dropping through of the said knife and guide) will be made in the cloth.

It will be seen from Figs. 3 and 4 that the triggerfand its adjuncts may be dispensed with and the cloth will automatically detach the knife 0 and guide I) from the jaws e which in this case may be mounted on springs e which will yield to the action of the cloth, when the guide and knife pierce the latter, and allow the said guide and knife to be detached from the holder CL.

0 a sliding piece or plateZ the lower edge of which is formed or provided with a socket or cylinder 6 The piecelis provided with a slot through which passes a fixed pivot or rod on, and the said piece Z is also connected to the spring 72, which has not only a tendency to withdraw Z and e but, when the catch Z thereof is engaged with the catch lever f the spring at has a tendency to hold it firmly locked thereby. Upon the fixed rod m is mounted loosely a lever orswing frame 0, supporting a hingedrod or piston 19, the free end of which works in the socket or cylinder c and when the sliding piece land the socket or cylinder 6 are drawn and locked forward in the position shown, the end of the piston 19 is at or about the point as in the cylinder 6 thereby forming a socket in which the rear end of the knifeccan be placed, and the said knife 0 andits guide Z) will be 'held in place as shown at Fig. 5, while the cutting is being properly performed, but should the point pierce through the cloth cl the latter will push in the triggerf and thus disengage the catch lever f from the upper end of the trigger leverf', and the catch Z and the piece Z will be released. The springn willinstantly withdraw the piece Z slidingit back upon the rod m and carrying the cylinder 6 with it and the cylinder e will slide upon the piston 19 until the end of the latter has pushed the rear end of the knife from the socket formed by itself and the cylinder c and the knife and guide are thus free to pass clear through the hole in the back of the cloth without enlarging the said hole or causing a slit to be made.

We would repeat in conclusion that other means may be adopted for detaching the knife and guide from the handle or holder Without departing from the principle of ourinvention, the mechanism above described and shown on the drawings being merely examples to illustrate how the said invention may be carried into practical effect.

We claim as our invention- 1. The combination of aguide and knife for cutting pile fabrics and a handle or holder in which said knife and guide are detachably held, with means for detaching said knife and guide from the said holder or handle whenever the point pierces through the back of the fabric, the knife and guide being free from projecting parts so as to then pass clear through the fabric without hinderance and without causing a large hole or slit, all substantially as described.

2. The combination ofaguide an knife for cutting pile fabrics and a handle or holder having a retaining device therefor, with means controlled by the cloth for automatically releasing said retaining device and separating the knife and guide from the said handle or holder whenever the point pierces through the back of the fabric, the said knife and guide being free from projecting parts so as to then pass clear through the fabric with- 9 out hinderance and without causing a large hole or slit, substantially as described.

3. The combination ofa guide and knife for cutting pile fabrics, a handle or holder therefor, and a retaining device connecting them together, with a trigger for releasing the retaining device for the separation of the knife and guide from the handle or holder, the said knife and guide being free from projecting parts so as to then pass clear through the fabric without hinderance and without causing a large hole or slit, all substantially as de scribed.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

DUGALD SCOTT. JOHN JAMES MANN. JAMES HOYLE SMITH.

Witnesses:

W. H. VAUDREY, JNo. HUGHES. 

